[Boost-users] [boost-users] Boost.Parameter: ArgumentPack - is type contained

Hi, I'm trying to test an ArgumentPack for containment of a certain parameter. Since an ArgumentPack is a valid MPL Sequence, I think boost::mpl::contains should do the trick, but I fail to specify the correct type. Consider the following BOOST_PARAMETER_NAME(color); template<class Opts> void function_with_opts(const Opts &opts) { boost::mpl::contains<Opts, /* what type goes here if I'd like to test if color is present in Opts ? */ > )); } Best regards, Christoph